parker



@uitrit ltutte l@strut @Him GARDNER R. PARKER, OE WORCESTER, MASSACHUSETTS, ASSIGN OR T DODGE AND WELLINGTGN, OF THE SAME PLACE.

Lettera Patent No. 65.422, dated June 4, 1867.

IMPBOVED CBNTRING ANDHSOUARING GHUKS.

TO JLv WHOM IT MAY CONCERN:

Be it known that I, GARDNER R. PARKER, of the city and countyl of Worcester, and Commonwealth of Mas-l sachusetts, have invented n. certain new and useful Improvement in .Cutter and Drill-Heads for centi-ing and squm'ng the ends of metal bars for shafts,jouinftls, and similar purposes; and I'do hereby declare that theV following is a full, clear, and exact description 'of the' same. reference being had to the accompanying drawings, forming n part of this specification, inwrhich- 4 Figure 1 represents a front vien of a cutter and drill-head containing my improvement, and

Figures 2 and 3 represent sections on lines A B and C D respectively.

My invention is an improvement on the device for centring bars of iron for which a patent was granted to N. F..Ne\vell on the 29th of January, 1861. By Newells plan three cutters .were used in what h e termed the chuek,-whicb corresponds to my cutter-head. When three cutters are used the point of the drill cannot bel supported properly, and the drill and cutters are alike liable to spring and break. `y my improvement these objections are obviated.

In the drawi'n s the art marked A h-.ison its back a ro'ection o" hub, u on which v.is cut a screw-threadv g P P J P to screw into a. plate which is to be fastened. to Vthe faceplate of a lathe. B is a slotted thimble, which is held in place by the set-screw C. The hole in the thimble Bis just about the size of the drill a, so that when` the set-screw C is turned down it compresses the slotted end of thimble B, or forces the parts b 6 closer together, so m'uch so that the drill is not only hel l firm but the thimble itself' is also secured in the part A. The slot in the front of the thimble B is shown `in dotted lines, g. 1. The cutters A A are held in the slotsiin the ears D D, with their cutting edges c c arranged so as to pass the drill,v as. shown in fig. 1. As the cutters Wear o" by use or grinding they are set up by the screws E E, `While they are held in place by the setscrews F und G, which are so arranged inv respect to their respective cutters that the cutting edges c c of the latter can be set out to cut more' or less, as may beI desired. The face o'f the part A, against which the back of the cutters rests, is made little thicker or inclined ont so as to set the edges c c out more than the Vhacks d d.' of the cutters, thus preventing friction, und' also' lrendering the cutters more effective. t will be observed that the cutters A A pass the drill a so as to give it a support on two sides, the ends of the cutters uniting to support the drill and keep it to thevworlt, while there is 'no chance for the metal to force its'way between the'drill and the cutters.

The mode of holding the bar and feeding it to the drill and cutters is the same as that described in the patent granted to said Newell.

Again, by my improvement the head or chuck part` A can bo taken from the face-plate and the drill ground without taking the latter from the thiinble B, which could not be done with cutters arranged after Newells plan.

Again, as the ends of the cutters pass in by the centre point cut by the drill a, they are not liable to break or chip off, as they were in the Newell plan.

Hnving described my cutter and drill-head for centrng and squaring the ends of bars and rods of' iron, what I claim as new, and of my invention, and desire to secure by Letters Patent, is-

The particular combination and relative arrangement of the head A, slnttedthimble B, drill a, and cutters A A', substantially as and for the purposes above'described.

i GARDITER'1%. PARKER.

Witnesses:

Guo. H. MILLER, JOHN E. Braces. 

